Contract Source Code (Solidity)

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•  contract MasterCopy
•    - function changeMasterCopy(address _ma ...
•  contract DSNote
•  contract DSMath
•    - function add(uint x, uint y)
•    - function sub(uint x, uint y)
•    - function mul(uint x, uint y)
•    - function div(uint x, uint y)
•    - function min(uint x, uint y)
•    - function max(uint x, uint y)
•    - function imin(int x, int y)
•    - function imax(int x, int y)
•    - function wmul(uint x, uint y)
•    - function rmul(uint x, uint y)
•    - function wdiv(uint x, uint y)
•    - function rdiv(uint x, uint y)
•    - function rpow(uint x, uint n)
•  contract Utils
• interface ERC20
•    - function name()
•    - function symbol()
•    - function decimals()
•    - function totalSupply()
•    - function balanceOf(address tokenOwner ...
•    - function allowance(address tokenOwner ...
•    - function transfer(address to, uint to ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address from, a ...
•  contract WETH9
•    - function()
•    - function deposit()
•    - function withdraw(uint wad)
•    - function totalSupply()
•    - function approve(address guy, uint wa ...
•    - function transfer(address dst, uint w ...
•    - function transferFrom(address src, ad ...
•  contract ErrorUtils
•  contract DSAuthority
•    - function canCall(address src, address ...
•  contract DSAuthEvents
•  contract DSAuth is DSAuthEvents
•    - function setOwner(address owner_)
•    - function setAuthority(DSAuthority aut ...
•    - function isAuthorized(address src, by ...
•  contract DSThing is DSNote, DSAuth ...
•    - function S(string s)
•  contract Config is DSNote, DSAuth, ...
•    - function setWETH9
•    - function setAccountHandler
•    - function toggleAdminsControl()
•    - function isAdminValid(address _admin)
•    - function getAllAdmins()
•    - function addAdmin
•    - function removeAdmin
• library ECRecovery
•    - function recover(bytes32 _hash, bytes ...
•    - function toEthSignedMessageHash(bytes ...
•  contract Utils2
•    - function _recoverSigner(bytes32 _hash ...
•  contract Account is MasterCopy, DS ...
•    - function init(address _user, address ...
•    - function getAllUsers()
•    - function balanceFor(address _token)
•    - function transferBySystem
•    - function transferByUser
•    - function addUser
•    - function removeUser
•    - function _getTransferActionHash
•    - function _getUserActionHash
•    - function()
•  contract Escrow is DSNote, DSAuth
•    - function transfer
•    - function transferFromAccount
•  contract ReserveEscrow is Escrow *

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/**
 *Submitted for verification at Etherscan.io on 2019-02-05
*/

pragma solidity 0.4.24;


contract MasterCopy {
    address masterCopy;

    function changeMasterCopy(address _masterCopy)
        public
    {
        require(_masterCopy != 0, "Invalid master copy address provided");
        masterCopy = _masterCopy;
    }
}


contract DSNote {
    event LogNote(
        bytes4   indexed  sig,
        address  indexed  guy,
        bytes32  indexed  foo,
        bytes32  indexed  bar,
        uint              wad,
        bytes             fax
    ) anonymous;

    modifier note {
        bytes32 foo;
        bytes32 bar;

        assembly {
            foo := calldataload(4)
            bar := calldataload(36)
        }

        emit LogNote(msg.sig, msg.sender, foo, bar, msg.value, msg.data);

        _;
    }
}


contract DSMath {
    function add(uint x, uint y) internal pure returns (uint z) {
        require((z = x + y) >= x);
    }
    function sub(uint x, uint y) internal pure returns (uint z) {
        require((z = x - y) <= x);
    }
    function mul(uint x, uint y) internal pure returns (uint z) {
        require(y == 0 || (z = x * y) / y == x);
    }

    // custom : not in original DSMath, putting it here for consistency, copied from SafeMath
    function div(uint x, uint y) internal pure returns (uint z) {
        z = x / y;
    }

    function min(uint x, uint y) internal pure returns (uint z) {
        return x <= y ? x : y;
    }
    function max(uint x, uint y) internal pure returns (uint z) {
        return x >= y ? x : y;
    }
    function imin(int x, int y) internal pure returns (int z) {
        return x <= y ? x : y;
    }
    function imax(int x, int y) internal pure returns (int z) {
        return x >= y ? x : y;
    }

    uint constant WAD = 10 ** 18;
    uint constant RAY = 10 ** 27;

    function wmul(uint x, uint y) internal pure returns (uint z) {
        z = add(mul(x, y), WAD / 2) / WAD;
    }
    function rmul(uint x, uint y) internal pure returns (uint z) {
        z = add(mul(x, y), RAY / 2) / RAY;
    }
    function wdiv(uint x, uint y) internal pure returns (uint z) {
        z = add(mul(x, WAD), y / 2) / y;
    }
    function rdiv(uint x, uint y) internal pure returns (uint z) {
        z = add(mul(x, RAY), y / 2) / y;
    }

    // This famous algorithm is called "exponentiation by squaring"
    // and calculates x^n with x as fixed-point and n as regular unsigned.
    //
    // It's O(log n), instead of O(n) for naive repeated multiplication.
    //
    // These facts are why it works:
    //
    //  If n is even, then x^n = (x^2)^(n/2).
    //  If n is odd,  then x^n = x * x^(n-1),
    //   and applying the equation for even x gives
    //    x^n = x * (x^2)^((n-1) / 2).
    //
    //  Also, EVM division is flooring and
    //    floor[(n-1) / 2] = floor[n / 2].
    //
    function rpow(uint x, uint n) internal pure returns (uint z) {
        z = n % 2 != 0 ? x : RAY;

        for (n /= 2; n != 0; n /= 2) {
            x = rmul(x, x);

            if (n % 2 != 0) {
                z = rmul(z, x);
            }
        }
    }
}


contract Utils {

    modifier addressValid(address _address) {
        require(_address != address(0), "Utils::_ INVALID_ADDRESS");
        _;
    }

}


interface ERC20 {

    function name() public view returns(string);
    function symbol() public view returns(string);
    function decimals() public view returns(uint8);
    function totalSupply() public view returns (uint);

    function balanceOf(address tokenOwner) public view returns (uint balance);
    function allowance(address tokenOwner, address spender) public view returns (uint remaining);
    function transfer(address to, uint tokens) public returns (bool success);
    function approve(address spender, uint tokens) public returns (bool success);
    function transferFrom(address from, address to, uint tokens) public returns (bool success);

    event Transfer(address indexed from, address indexed to, uint tokens);
    event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
}


contract WETH9 {
    string public name     = "Wrapped Ether";
    string public symbol   = "WETH";
    uint8  public decimals = 18;

    event  Approval(address indexed _owner, address indexed _spender, uint _value);
    event  Transfer(address indexed _from, address indexed _to, uint _value);
    event  Deposit(address indexed _owner, uint _value);
    event  Withdrawal(address indexed _owner, uint _value);

    mapping (address => uint)                       public  balanceOf;
    mapping (address => mapping (address => uint))  public  allowance;

    function() public payable {
        deposit();
    }

    function deposit() public payable {
        balanceOf[msg.sender] += msg.value;
        Deposit(msg.sender, msg.value);
    }

    function withdraw(uint wad) public {
        require(balanceOf[msg.sender] >= wad);
        balanceOf[msg.sender] -= wad;
        msg.sender.transfer(wad);
        Withdrawal(msg.sender, wad);
    }

    function totalSupply() public view returns (uint) {
        return this.balance;
    }

    function approve(address guy, uint wad) public returns (bool) {
        allowance[msg.sender][guy] = wad;
        Approval(msg.sender, guy, wad);
        return true;
    }

    function transfer(address dst, uint wad) public returns (bool) {
        return transferFrom(msg.sender, dst, wad);
    }

    function transferFrom(address src, address dst, uint wad)
        public
        returns (bool)
    {
        require(balanceOf[src] >= wad);

        if (src != msg.sender && allowance[src][msg.sender] != uint(-1)) {
            require(allowance[src][msg.sender] >= wad);
            allowance[src][msg.sender] -= wad;
        }

        balanceOf[src] -= wad;
        balanceOf[dst] += wad;

        Transfer(src, dst, wad);

        return true;
    }
}


contract ErrorUtils {
    event LogError(string methodSig, string errMsg);
    event LogErrorWithHintBytes32(bytes32 indexed bytes32Value, string methodSig, string errMsg);
    event LogErrorWithHintAddress(address indexed addressValue, string methodSig, string errMsg);

}


contract DSAuthority {
    function canCall(address src, address dst, bytes4 sig) public view returns (bool);
}


contract DSAuthEvents {
    event LogSetAuthority (address indexed authority);
    event LogSetOwner     (address indexed owner);
}


contract DSAuth is DSAuthEvents {
    DSAuthority  public  authority;
    address      public  owner;

    constructor() public {
        owner = msg.sender;
        emit LogSetOwner(msg.sender);
    }

    function setOwner(address owner_)
        public
        auth
    {
        owner = owner_;
        emit LogSetOwner(owner);
    }

    function setAuthority(DSAuthority authority_)
        public
        auth
    {
        authority = authority_;
        emit LogSetAuthority(authority);
    }

    modifier auth {
        require(isAuthorized(msg.sender, msg.sig), "DSAuth::_ SENDER_NOT_AUTHORIZED");
        _;
    }

    function isAuthorized(address src, bytes4 sig) internal view returns (bool) {
        if (src == address(this)) {
            return true;
        } else if (src == owner) {
            return true;
        } else if (authority == DSAuthority(0)) {
            return false;
        } else {
            return authority.canCall(src, this, sig);
        }
    }
}


contract DSThing is DSNote, DSAuth, DSMath {

    function S(string s) internal pure returns (bytes4) {
        return bytes4(keccak256(s));
    }

}


contract Config is DSNote, DSAuth, Utils {

    WETH9 public weth9;
    mapping (address => bool) public isAccountHandler;
    mapping (address => bool) public isAdmin;
    address[] public admins;
    bool public disableAdminControl = false;
    
    event LogAdminAdded(address indexed _admin, address _by);
    event LogAdminRemoved(address indexed _admin, address _by);

    constructor() public {
        admins.push(msg.sender);
        isAdmin[msg.sender] = true;
    }

    modifier onlyAdmin(){
        require(isAdmin[msg.sender], "Config::_ SENDER_NOT_AUTHORIZED");
        _;
    }

    function setWETH9
    (
        address _weth9
    ) 
        public
        auth
        note
        addressValid(_weth9) 
    {
        weth9 = WETH9(_weth9);
    }

    function setAccountHandler
    (
        address _accountHandler,
        bool _isAccountHandler
    )
        public
        auth
        note
        addressValid(_accountHandler)
    {
        isAccountHandler[_accountHandler] = _isAccountHandler;
    }

    function toggleAdminsControl() 
        public
        auth
        note
    {
        disableAdminControl = !disableAdminControl;
    }

    function isAdminValid(address _admin)
        public
        view
        returns (bool)
    {
        if(disableAdminControl) {
            return true;
        } else {
            return isAdmin[_admin];
        }
    }

    function getAllAdmins()
        public
        view
        returns(address[])
    {
        return admins;
    }

    function addAdmin
    (
        address _admin
    )
        external
        note
        onlyAdmin
        addressValid(_admin)
    {   
        require(!isAdmin[_admin], "Config::addAdmin ADMIN_ALREADY_EXISTS");

        admins.push(_admin);
        isAdmin[_admin] = true;

        emit LogAdminAdded(_admin, msg.sender);
    }

    function removeAdmin
    (
        address _admin
    ) 
        external
        note
        onlyAdmin
        addressValid(_admin)
    {   
        require(isAdmin[_admin], "Config::removeAdmin ADMIN_DOES_NOT_EXIST");
        require(msg.sender != _admin, "Config::removeAdmin ADMIN_NOT_AUTHORIZED");

        isAdmin[_admin] = false;

        for (uint i = 0; i < admins.length - 1; i++) {
            if (admins[i] == _admin) {
                admins[i] = admins[admins.length - 1];
                admins.length -= 1;
                break;
            }
        }

        emit LogAdminRemoved(_admin, msg.sender);
    }
}

library ECRecovery {

    function recover(bytes32 _hash, bytes _sig)
        internal
        pure
    returns (address)
    {
        bytes32 r;
        bytes32 s;
        uint8 v;

        if (_sig.length != 65) {
            return (address(0));
        }

        assembly {
            r := mload(add(_sig, 32))
            s := mload(add(_sig, 64))
            v := byte(0, mload(add(_sig, 96)))
        }

        if (v < 27) {
            v += 27;
        }

        if (v != 27 && v != 28) {
            return (address(0));
        } else {
            return ecrecover(_hash, v, r, s);
        }
    }

    function toEthSignedMessageHash(bytes32 _hash)
        internal
        pure
    returns (bytes32)
    {
        return keccak256(
            abi.encodePacked("\x19Ethereum Signed Message:\n32", _hash)
        );
    }
}


contract Utils2 {
    using ECRecovery for bytes32;
    
    function _recoverSigner(bytes32 _hash, bytes _signature) 
        internal
        pure
        returns(address _signer)
    {
        return _hash.toEthSignedMessageHash().recover(_signature);
    }

}


contract Account is MasterCopy, DSNote, Utils, Utils2, ErrorUtils {

    address[] public users;
    mapping (address => bool) public isUser;
    mapping (bytes32 => bool) public actionCompleted;

    WETH9 public weth9;
    Config public config;
    bool public isInitialized = false;

    event LogTransferBySystem(address indexed token, address indexed to, uint value, address by);
    event LogTransferByUser(address indexed token, address indexed to, uint value, address by);
    event LogUserAdded(address indexed user, address by);
    event LogUserRemoved(address indexed user, address by);

    modifier initialized() {
        require(isInitialized, "Account::_ ACCOUNT_NOT_INITIALIZED");
        _;
    }

    modifier userExists(address _user) {
        require(isUser[_user], "Account::_ INVALID_USER");
        _;
    }

    modifier userDoesNotExist(address _user) {
        require(!isUser[_user], "Account::_ USER_DOES_NOT_EXISTS");
        _;
    }

    modifier onlyHandler(){
        require(config.isAccountHandler(msg.sender), "Account::_ INVALID_ACC_HANDLER");
        _;
    }

    function init(address _user, address _config) public {
        users.push(_user);
        isUser[_user] = true;
        config = Config(_config);
        weth9 = config.weth9();
        isInitialized = true;
    }
    
    function getAllUsers() public view returns (address[]) {
        return users;
    }

    function balanceFor(address _token) public view returns (uint _balance){
        _balance = ERC20(_token).balanceOf(this);
    }
    
    function transferBySystem
    (   
        address _token,
        address _to,
        uint _value
    ) 
        external 
        onlyHandler
        note 
        initialized
    {
        require(ERC20(_token).balanceOf(this) >= _value, "Account::transferBySystem INSUFFICIENT_BALANCE_IN_ACCOUNT");
        require(ERC20(_token).transfer(_to, _value), "Account::transferBySystem TOKEN_TRANSFER_FAILED");

        emit LogTransferBySystem(_token, _to, _value, msg.sender);
    }
    
    function transferByUser
    (   
        address _token,
        address _to,
        uint _value,
        uint _salt,
        bytes _signature
    ) 
        external
        addressValid(_to)
        note
        initialized
    {
        bytes32 actionHash = _getTransferActionHash(_token, _to, _value, _salt);

        if(actionCompleted[actionHash]) {
            emit LogError("Account::transferByUser", "ACTION_ALREADY_PERFORMED");
            return;
        }

        if(ERC20(_token).balanceOf(this) < _value){
            emit LogError("Account::transferByUser", "INSUFFICIENT_BALANCE_IN_ACCOUNT");
            return;
        }

        address signer = _recoverSigner(actionHash, _signature);

        if(!isUser[signer]) {
            emit LogError("Account::transferByUser", "SIGNER_NOT_AUTHORIZED_WITH_ACCOUNT");
            return;
        }

        actionCompleted[actionHash] = true;
        
        if (_token == address(weth9)) {
            weth9.withdraw(_value);
            _to.transfer(_value);
        } else {
            require(ERC20(_token).transfer(_to, _value), "Account::transferByUser TOKEN_TRANSFER_FAILED");
        }

        emit LogTransferByUser(_token, _to, _value, signer);
    }

    function addUser
    (
        address _user,
        uint _salt,
        bytes _signature
    )
        external 
        note 
        addressValid(_user)
        userDoesNotExist(_user)
        initialized
    {   
        bytes32 actionHash = _getUserActionHash(_user, "ADD_USER", _salt);
        if(actionCompleted[actionHash])
        {
            emit LogError("Account::addUser", "ACTION_ALREADY_PERFORMED");
            return;
        }

        address signer = _recoverSigner(actionHash, _signature);

        if(!isUser[signer]) {
            emit LogError("Account::addUser", "SIGNER_NOT_AUTHORIZED_WITH_ACCOUNT");
            return;
        }

        actionCompleted[actionHash] = true;

        users.push(_user);
        isUser[_user] = true;

        emit LogUserAdded(_user, signer);
    }

    function removeUser
    (
        address _user,
        uint _salt,
        bytes _signature
    ) 
        external
        note
        userExists(_user) 
        initialized
    {   
        bytes32 actionHash = _getUserActionHash(_user, "REMOVE_USER", _salt);

        if(actionCompleted[actionHash]) {
            emit LogError("Account::removeUser", "ACTION_ALREADY_PERFORMED");
            return;
        }

        address signer = _recoverSigner(actionHash, _signature);
        
        // require(signer != _user, "Account::removeUser SIGNER_NOT_AUTHORIZED_WITH_ACCOUNT");
        if(!isUser[signer]){
            emit LogError("Account::removeUser", "SIGNER_NOT_AUTHORIZED_WITH_ACCOUNT");
            return;
        }
        
        actionCompleted[actionHash] = true;

        isUser[_user] = false;
        for (uint i = 0; i < users.length - 1; i++) {
            if (users[i] == _user) {
                users[i] = users[users.length - 1];
                users.length -= 1;
                break;
            }
        }

        emit LogUserRemoved(_user, signer);
    }

    function _getTransferActionHash
    ( 
        address _token,
        address _to,
        uint _value,
        uint _salt
    ) 
        internal
        view
        returns (bytes32)
    {
        return keccak256(
            abi.encodePacked(
                address(this),
                _token,
                _to,
                _value,
                _salt
            )
        );
    }

    function _getUserActionHash
    ( 
        address _user,
        string _action,
        uint _salt
    ) 
        internal
        view
        returns (bytes32)
    {
        return keccak256(
            abi.encodePacked(
                address(this),
                _user,
                _action,
                _salt
            )
        );
    }

    // to directly send ether to contract
    function() external payable {
        require(msg.data.length == 0 && msg.value > 0, "Account::fallback INVALID_ETHER_TRANSFER");

        if(msg.sender != address(weth9)){
            weth9.deposit.value(msg.value)();
        }
    }
    
}


contract Escrow is DSNote, DSAuth {

    event LogTransfer(address indexed token, address indexed to, uint value);
    event LogTransferFromAccount(address indexed account, address indexed token, address indexed to, uint value);

    function transfer
    (
        address _token,
        address _to,
        uint _value
    )
        public
        note
        auth
    {
        require(ERC20(_token).transfer(_to, _value), "Escrow::transfer TOKEN_TRANSFER_FAILED");
        emit LogTransfer(_token, _to, _value);
    }

    function transferFromAccount
    (
        address _account,
        address _token,
        address _to,
        uint _value
    )
        public
        note
        auth
    {   
        Account(_account).transferBySystem(_token, _to, _value);
        emit LogTransferFromAccount(_account, _token, _to, _value);
    }

}

contract ReserveEscrow is Escrow {

}

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